CVE-2026-86257 wger before 2.6 CSV Formula Injection via member export
Attackers can inject malicious spreadsheet formulas into exported gym member data, leading to code execution or data exfiltration when admins open the file.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-86257?
CVE-2026-86257 is a medium-severity vulnerability in wger-project wger, published on 6 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
wger before 2.6 fails to sanitize first_name and last_name fields in the gym member TSV export endpoint, allowing any gym member to inject spreadsheet formulas. Attackers can inject formulas like =HYPERLINK to exfiltrate admin data or execute code when admins open the exported file in Excel or LibreOffice Calc.
Weakness: CWE-1236
Which versions are affected by CVE-2026-86257?
2 open source packages ship an affected version, including wger.
| Package | Affected | Fixed in |
|---|---|---|
wger PyPI | All versions | 2.6 |
wger PyPI | All versions | 2.6 |
How do I fix CVE-2026-86257?
Upgrade wger to 2.6 or later.
Is CVE-2026-86257 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86257 exists.
Sources
Also known as GHSA-pmr9-wpc3-f495, GHSA-xq9m-hmp9-fw87.